05/12-W2010-Wei
Instruction sheet 745 05
Manual Synchronization Unit
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





1




Description
Manual synchronization unit to synchronize a generated 3
phase voltage to the mains, regarding the following
conditions:





2
The field’s rotation direction
Voltage amplitudes
Frequencies












3
Line mains input L1, L2, L3 and N
Generator mains input L’1, L’2, L’3
Synchronization lamps
Synchronization switch (0 = OFF, 1 = ON)
Unit’s main switch
Mains voltage and frequency display (U1 and f1)
Generator’s
(U2 and f2)
voltage
and
frequency
display
Zero-Volt indicator U
Synchronoscope
Indicators for the directions of the rotating fields
Use only under dry conditions and with safety leads!
For measurements use an isolated measurement
amplifier!
Technical data
U max = 3 x 400 V
U’max = 3 x 400 V
fnom = 50/60 Hz
Imax = 8 A
Voltage difference (Zero-Volt-Indication)
Phase shift conditions
Safety
This device is designed according to protection class I and
corresponds to the safety directives as set forth in EN 61010.
Safety is not ensured if the device is operated improperly or
handled without care.

This device may only be operated in the upright position
in the panel frame provided for its operation (cooling).

If you assume that safe operation is no longer possible
(e.g. in the case of visible damage), then the device
must be switched off immediately and secured to
prevent it from being accidentally put back into
operation.

Do not apply any voltage higher than the rated!
Note:
The neural points of the mains and the generator must be
connected together!
Instruction sheet
4
Page 2/2
Sample experiment
Set-up
Preparation:

Connect the synchronization unit’s inputs  to the
mains - e. g. using 726 75 - and the generator –
e. g. 733 07 - to the inputs .

Connect the neutral of the mains, the generator and
the synchronization unit.

Apply the DC excitation voltage of 745 021 to the
synchronous machine’s inputs F1 and F2.

Connect the LEDs for lamp synchronization using
the “dark circuit” as shown above (blue, red and
green coloured leads in the above figure).
Observe the LED ring synchronoscope: as soon as the upper
most green LED lights up, synchronize the generator to the
mains by switching the switch from 0 to 1 position.
Finally press the black MODE button of 732 689 twice to
select TORQUE CONTROL.
Note:
Make sure, the Synchronization unit’s switch  is set to 0
(OFF)!
Experiment:
Turn on all devices, start the drive (732 689USB) by pressing
the red push button (M=0). Then increase the speed using
the black centre control knob up to 1500 rpm (50 Hz) or
1800 rpm (60 Hz).
Now increase the generator’s excitation voltage Vexc slowly
using the black push buttons on the excitation voltage
controller 745 021 while observing the U2 voltage display until
the value matches the value of U1 (app. Vexc = 40 V).
Check the direction of the rotating fields: both directions must
be cw or ccw – both LEDs green or red!
LD DIDACTIC GMBH  Leyboldstrasse 1  D-50354 Hürth  Phone (02233) 604-0  Fax (02233) 604-222  e-mail: info@leybold-didactic.de
by LD Didactic GmbH
Printed in the Federal Republic of Germany
Technical alterations reserved